Definition
A Latin phrase meaning "to be" or "to be present." In historical legal usage, ad essendum appears in procedural writs and court records to indicate that a person was required or commanded to appear — physically to be — before a court or judicial officer. It functions as a directional or obligatory phrase, typically embedded within a longer writ formula specifying where, before whom, and for what purpose the person was to present themselves.
The phrase appears in two principal historical contexts:
1. Ad essendum coram justiciariis — "to be before the justices." A directive requiring a party or person to appear personally before the justices of a court.
2. Ad essendum de consilio suo — "to be of his counsel." A phrase indicating that a person was to serve as or be retained as legal counsel to another.
Common Confusion
Ad essendum should not be confused with ad comparendum, which similarly expresses a duty to appear but is more specifically associated with appearance writs in the context of summoning defendants. Ad essendum is a broader formulation denoting presence or being, and its precise legal force depends entirely on the phrase in which it is embedded. Researchers encountering either term in medieval or early modern records should read the full writ context before drawing conclusions about procedural posture.
Why It Matters in Research
Ad essendum is a pure artifact of Latin legal drafting and will appear almost exclusively in pre-modern English legal records — plea rolls, year books, writs, and treatises written before Law Latin was abolished in English courts by statute in 1731. Researchers working in the Law Mind corpus on medieval or early modern procedure, court jurisdiction, or the history of legal representation will encounter this phrase as a building block of writ language rather than as a stand-alone doctrine.
The two attested forms carry meaningfully different implications. Ad essendum coram justiciariis speaks to personal appearance jurisdiction — a court's power to compel physical presence — and connects to the broader history of attendance obligations and contempt. Ad essendum de consilio suo touches on the early history of legal representation and the relationship between parties and counsel, a subject of significant historical development through the Year Books.
Neither form will appear in modern legal documents. If a researcher encounters ad essendum in a contemporary source, it is almost certainly a quotation from or reference to a historical text. The phrase has no active doctrinal life in modern common law jurisdictions.
Historical Dictionary Support
Burrill's Law Dictionary is the sole shelf source for this term and provides two citations that anchor both recognized forms: Fleta, lib. 2, c. 50, § 12 for the coram justiciariis usage, and the Year Books (P. 11 Hen. VI. 1) for the de consilio suo usage. Burrill offers definition by illustration rather than analysis, which is characteristic of his treatment of Latin particles and connective phrases — he records usage without elaborating on doctrinal significance.
Fleta, the thirteenth-century legal treatise, is a reliable primary source for procedural Latin of that period. The Year Book citation (11 Henry VI) places the counsel usage in the early fifteenth century, a period when the relationship between parties and their legal advisers was becoming more formalized in English practice. No modern legal dictionary of note carries this term, and its absence from Black's and Bouvier's reflects its purely historical character. Researchers needing deeper context should consult secondary literature on Year Book procedure and the history of the English legal profession rather than expecting additional dictionary support.